In the past I've read articles and message board comments asking why the US doesn't appear to be shaping events during the end times in the Bible. I don't claim to have any special input on it, but an economic collapse could remove America's influence in the world.
If that turns out to be the case the irony would be that liberals accused evengelicals of trying to bring about end time events but it'd actually turn out to be liberals who did it.
When the end of the world comes, I believe it will be liberals who will cause it to happen.